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The Stata Journal
Volume 4 Number 3: pp. 290-311

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Implementing matching estimators for average treatment effects in Stata

Alberto Abadie
Harvard University
 David Drukker
StataCorp
Jane Leber Herr
UC Berkeley
 Guido W. Imbens
UC Berkeley
Abstract.   This paper presents an implementation of matching estimators for average treatment effects in Stata. The nnmatch command allows you to estimate the average effect for all units or only for the treated or control units; to choose the number of matches; to specify the distance metric; to select a bias adjustment; and to use heteroskedastic-robust variance estimators.
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